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R x _ <br /> R <br /> -3 <br /> oil storage tank were removed from the site. The San Joaquin County Environmental Health <br /> Department (County) did not require soil samples to be collected during the excavation of the <br /> tanks. <br /> In October 1985, the County required GLDM to condact a site investigation because of <br /> suspected leaks;a front the 1,000-gallon waste oil tank. During this investigation, four F <br /> groundwater monitoring wells (MW-1 through MW-4 as shown on Figure I-I)were installed by <br /> J.H. Kleinfelder Inc. (Kleinf-Ider). Two soil samples,one from 40 feet in MW-3 and one from <br /> 40 feet in MW-4, identified hydiocarbons (gasoline/diesel)„ Guiundwater samples from wells <br /> MW-3 and MW-4 identified hydrocarbons (gasoline/diesel). The results of this investigation are <br /> r. <br /> presented in K1e.infeWer's December 2, 1985 Ground Water Monitoring Report. <br /> In February 1986, SCC was retained by GI.DM to conduct a .second site investigation at <br /> the site. This investigation included the drilling of five boreholes (GL-I through GL-5 as shown <br /> on Figure 1-1)to define the vertical and lateral extent of hydrocarbons in the soil. Hy1rocarbons <br /> were identified in the soil samples collected from GL-2, GL-3, and GL-5. The results of this <br /> investigation are presented in BCC's April 15, 1986, Final Site Investigation Report. <br /> In July 1986,BCC installed monitoring well MW-5 in the northwest corner of the site about <br /> 40 feet north of the location of MW-4. Hydrocarbons were identified in the soil and groundwater <br /> collected from this well. Because the results of this investigation indicated that hydrocarbons <br /> were present in the soil and groundwater, further investigatior was needed to adequately define <br /> the extent of hydrocarbons. The purpose of the current investigaeion is to more completely define <br /> J the extent of hydrocarbons in the soil and groundwater. <br />